Hi, As everyone suggested try to get, Ad-Aware, Spy Bor Search & Destroy, Spy-Doctor.
But if you ask me GET SERVICE PACK 2
Its cool to stop cokies and popups, but the rest of it is not that good.
If you get Spyware Search and Destroy.
Just Select you C: and scan your Coumputer.
Same with any other software you are using.
If you have WINDOWS XP, I had the same problem.
1. Go to Control Panel
2. Add Remove Programs
3. Find the progrm and remove it